$zIndex = 1
.progress-bar
  position: relative
  width: 100%
  height: 3px
  background-color: rgba(0, 0, 0, 0.3);
  .progress-load, .progress, .progress-button
    position: absolute
    top: 0
    left: 0
    height: 100%
  .progress-load
    z-index: $zIndex
  .progress
    z-index: $zIndex + 1
    background-color: #FFD700
  .progress-button
    width: 14px
    height: 14px
    border: 2px solid #FFFFFF
    border-radius: 50%
    box-sizing: border-box
    background-color: #FFD700
    z-index: $zIndex + 2
    top: -6px
    margin-left: -5px